Fin type heat exchanger flow path structure for improving bottom frosting and refrigerating or heating equipment

Abstract

The utility model relates to a fin type heat exchanger flow path structure for improving bottom frosting and refrigerating or heating equipment, which comprises a plurality of heat exchange tube columns, and the heat exchange tube columns are arranged in the direction from the windward side to the leeward side of a heat exchange fin; the refrigerant liquid pipe and the refrigerant gas pipe are respectively connected into each heat exchange pipe column; the heat exchanger further comprises a bottom flow path set arranged at the bottom of the heat exchange fins, and the bottom flow path set comprises a first open loop flow path, a second open loop flow path and a third open loop flow path. By optimizing the refrigerant flow path at the bottom of the heat exchanger, the heat exchange of the refrigerant flow path at the bottom of the fin heat exchanger is more uniform, so that the problem that the bottom of the fin heat exchanger is easy to frost is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump heat exchanger equipment, in particular to a fin heat exchanger flow path structure for improving bottom frosting and a refrigeration or heating device. Background Art

[0002] Finned heat exchangers are widely used in heating or refrigeration equipment such as air source heat pumps, especially in pool heat pump cold and hot water units. The machine uses a fan to drive air to enter from one side of the fin heat exchanger and flow out from the other side, enabling the refrigerant in the heat exchanger to exchange heat with the air flow passing through the fin heat exchanger. As Figure 1 and Figure 2 shown, the finned heat exchangers used in conventional pool heat pump cold and hot water units are generally two-row pipes or three-row pipes, and the pipe orifices of each row are connected in series between the liquid pipe and the gas pipe. When the fin heat exchanger is used as an evaporator, the refrigerant flows into each row of pipes of the fin heat exchanger from the liquid pipe, absorbs heat and vaporizes in the pipes, and then flows out from the gas pipe. Under the action of the compressor, the refrigerant transfers heat to water to achieve the water heating effect; on the contrary, when the fin heat exchanger is used as a condenser, the refrigerant flows into each row of pipes of the fin heat exchanger from the gas pipe, liquefies and releases heat in the pipes, and then flows out from the liquid pipe. Under the action of the throttling mechanism, the water is cooled after releasing heat under the action of the refrigerant to achieve the refrigeration effect. The more commonly used fin heat exchanger structure can be referred to Figure 1 and Figure 2 shown. It generally has three rows of heat exchange pipes arranged longitudinally. The three rows of heat exchange pipes are divided into 36 orifices arranged vertically. The liquid pipe and the gas pipe responsible for inputting the refrigerant are respectively provided with 18 parallel branch pipelines, and the 18 branch pipelines are respectively connected in series with two orifices in each row of heat exchange pipes. This existing pipeline structure will make the flow path of the heat exchanger too short, the flow distance of the refrigerant in the fin heat exchanger is short, the condensation or vaporization in the pipes of the fin heat exchanger is insufficient, and during the process of the air flow of the fan entering the fin heat exchanger, the first row of heat exchange pipes closest to the left side is located on the windward side of the heat exchanger, so the heat exchange effect of this row of heat exchange pipes is better, while the third row of heat exchange pipes closest to the right side is located on the leeward side of the heat exchanger, so the heat exchange effect of this row of heat exchange pipes is poor, resulting in uneven heat exchange of the heat exchanger and having certain defects. This kind of flow path design will also cause uneven flow distribution when the pool heat pump cold and hot water unit operates in the heating condition and the fin heat exchanger is used as an evaporator, resulting in poor heat exchange effect. In the low-temperature condition, ice even appears at the bottom of the heat exchanger, resulting in a long defrosting cycle and incomplete defrosting; when operating in the refrigeration condition and the fin heat exchanger is used as a condenser, the heat exchange efficiency is low, resulting in high power consumption of the whole machine and high compressor exhaust temperature. Therefore, the conventional fin heat exchanger flow path is difficult to balance the refrigeration / heating conditions of the pool heat pump cold and hot water unit. Content of the Utility Model

[0003] To solve at least one of the above-mentioned technical problems existing in the prior art, the present utility model provides a fin heat exchanger flow path structure for improving bottom frosting and a refrigeration or heating device. By optimizing the refrigerant flow path at the bottom of the heat exchanger, the heat exchange of the refrigerant flow path at the bottom of the fin heat exchanger becomes more uniform, thereby helping to improve the problem of easy frosting at the bottom of the fin heat exchanger.

[0004] A fin heat exchanger flow path structure for improving bottom frosting according to the present utility model includes:

[0005] A plurality of heat exchange tube columns, each including a plurality of vertically arranged heat exchange tubes. Each of the heat exchange tube columns is used to connect the heat exchange fins in the heat pump in series and is arranged in the direction from the windward side to the leeward side of the heat exchange fins;

[0006] A refrigerant liquid pipe and a refrigerant gas pipe, the refrigerant liquid pipe and the refrigerant gas pipe are respectively connected to each of the heat exchange tube columns; it further includes a bottom flow path group for being arranged at the bottom position of the heat exchange fins. The bottom flow path group includes a first open circulation flow path, a second open circulation flow path, and a third open circulation flow path;

[0007] One end of the first open circulation flow path is connected in series with several heat exchange tubes with relatively high arranged positions among the heat exchange tube columns close to the windward side, and the other end of the first open circulation flow path is connected in series with several heat exchange tubes with relatively low arranged positions among the heat exchange tube columns close to the leeward side;

[0008] One end of the second open circulation flow path is connected in series with several heat exchange tubes with relatively low arranged positions among the heat exchange tube columns close to the windward side, and the other end of the second open circulation flow path is connected in series with several heat exchange tubes with relatively high arranged positions among the heat exchange tube columns close to the leeward side;

[0009] Both ends of the third open circulation flow path are respectively connected in series with several heat exchange tubes with relatively high arranged positions and several heat exchange tubes with relatively low arranged positions among the heat exchange tube columns located between the windward side and the leeward side.

[0010] According to a fin heat exchanger flow path structure for improving bottom frosting of the present utility model, the first open circulation flow path, the second open circulation flow path, and the third open circulation flow path are respectively connected in series with the same number of heat exchange tubes.

[0011] According to a fin heat exchanger flow path structure for improving bottom frosting of the present utility model:

[0012] Among the heat exchange tube columns close to the windward side, the first open circulation flow path is connected in series with 4 heat exchange tubes with relatively high arranged positions, and the second open circulation flow path is connected in series with 4 heat exchange tubes with relatively low arranged positions;

[0013] Among the longitudinal rows of heat exchange tubes close to the leeward side, the first open circulation path is connected in series to 4 heat exchange tubes with relatively lower arrangement positions, and the second open circulation path is connected in series to 4 heat exchange tubes with relatively higher arrangement positions;

[0014] Between the windward side and the leeward side of the heat exchange fins, the upper flow path of the third open circulation path is connected in series to 4 heat exchange tubes with relatively higher arrangement positions, and the lower flow path of the third open circulation path is connected in series to 4 heat exchange tubes with relatively lower arrangement positions.

[0015] According to a fin heat exchanger flow path structure for improving bottom frosting of the present utility model, on the windward side of the heat exchange fins, the lower end of the first open circulation path is connected to the refrigerant liquid pipe, and the upper end of the second open circulation path is connected to the refrigerant gas pipe;

[0016] On the leeward side of the heat exchange fins, the upper end of the first open circulation path is connected to the refrigerant gas pipe, and the lower end of the second open circulation path is connected to the refrigerant liquid pipe;

[0017] Between the windward side and the leeward side of the heat exchange fins, the lower end of the upper flow path of the third open circulation path is connected to the refrigerant liquid pipe, and the upper end of the lower flow path of the third open circulation path is connected to the refrigerant gas pipe.

[0018] According to a fin heat exchanger flow path structure for improving bottom frosting of the present utility model:

[0019] The refrigerant liquid pipe includes a main liquid pipe, and a plurality of liquid distribution pipes are connected in parallel to the main liquid pipe, and each liquid distribution pipe is respectively connected to each longitudinal row of the heat exchange tubes;

[0020] The refrigerant gas pipe includes a main gas pipe, and a plurality of gas distribution pipes are connected in parallel to the main gas pipe, and each gas distribution pipe is respectively connected to each longitudinal row of the heat exchange tubes.

[0021] According to a fin heat exchanger flow path structure for improving bottom frosting of the present utility model:

[0022] On the windward side of the heat exchange fins, the lower end of the first open circulation path is connected to one of the liquid distribution pipes; on the leeward side of the heat exchange fins, the upper end of the first open circulation path is connected to one of the gas distribution pipes;

[0023] On the windward side of the heat exchange fins, the upper end of the second open circulation path is connected to one of the gas distribution pipes; on the leeward side of the heat exchange fins, the lower end of the second open circulation path is connected to one of the liquid distribution pipes;

[0024] Between the windward side and the leeward side of the heat exchange fins, the lower end of the upper flow path of the third open circulation path is connected to one of the liquid distribution pipes, and the upper end of the lower flow path of the third open circulation path is connected to one of the gas distribution pipes.

[0025] According to a flow path structure of a fin heat exchanger for improving bottom frosting of the utility model:

[0026] It also includes a top flow path arranged near the top of the heat exchange fin, and the top flow path connects adjacent heat exchange tube columns to each other by serially connecting the heat exchange tubes in each heat exchange tube column.

[0027] According to a flow path structure of a fin heat exchanger for improving bottom frosting of the utility model, at least two heat exchange tubes in each vertical row of heat exchange tubes are connected in series by the top flow path.

[0028] According to a flow path structure of a fin heat exchanger for improving bottom frosting of the utility model, one end of the top flow path is connected to one of the liquid distribution pipes, and the other end is connected to one of the gas distribution pipes.

[0029] Based on the above, the utility model further discloses a refrigeration or heating device, the structure of which includes the fin heat exchanger flow path structure for improving bottom frost of the utility model.

[0030] The utility model discloses a fin heat exchanger flow path structure for improving bottom frosting, which adopts a cross-tube arrangement of upper and lower cross-tubes, and the heat exchange tubes near the top and bottom positions of the heat exchange fins are connected by a structure of three open loop flow paths, which is equivalent to adopting a cross-tube arrangement combined with an upper and lower cross-tube arrangement, and the flow paths of the first row of heat exchange tubes and the third row of heat exchange tubes are cross-arranged to balance the heat exchange effects of the leeward side and the windward side. This method is adopted because the conventional arrangement of the lower flow path of the heat exchanger will lead to low bottom temperature and severe frosting under low-temperature heating conditions. If the water tray does not drain smoothly, it will cause ice to form at the bottom of the heat exchanger, further deteriorating the heat exchange of the evaporator, resulting in a longer defrosting time and incomplete defrosting. The upper and lower cross-tubes of this embodiment, combined with the cross-tube arrangement, can make the heat exchange more uniform, the bottom temperature will not be very low, and the phenomenon of ice formation at the bottom of the heat exchanger can be effectively avoided, thereby improving the heat exchange effect of the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a flow path structure diagram of a fin heat exchanger of the prior art (as a schematic diagram of the refrigerant flow direction in the evaporator state);

[0033] Figure 2is a flow path structure diagram of a finned heat exchanger in the prior art (a schematic diagram of the refrigerant flow direction in the condenser state);

[0034] Figure 3 is a flow path structure diagram of the present invention (a schematic diagram of the refrigerant flow direction in the evaporator state);

[0035] Figure 4 is a flow path structure diagram of the present invention (a schematic diagram of the refrigerant flow direction in the condenser state).

[0036] Reference numerals:

[0037] 100, middle flow path group; 200, bottom flow path group, 201, first open circulation flow path,

[0038] 202, second open circulation flow path, 203, third open circulation flow path; 1, longitudinal row of heat exchange tubes,

[0039] 11, heat exchange tubes; 2, refrigerant liquid pipe, 21, main liquid pipe, 22, liquid distribution pipe; 3, refrigerant gas pipe, 31, main gas pipe, 32, gas distribution pipe; 4, single connection flow path; 5, first cross-connection flow path;

[0040] 6, second cross-connection flow path; 7, top flow path. Detailed implementation manners

[0041] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0042] As Figures 3 to 4As shown in the figure, a fin heat exchanger flow path structure for improving bottom frosting in this embodiment includes three rows of heat exchange tubes 1 arranged longitudinally on the heat exchange fins, a refrigerant liquid pipe 2, and a refrigerant gas pipe 3. It also includes a bottom flow path group 200 arranged at the bottom of the heat exchange fins. Each row of heat exchange tubes 1 includes a plurality of heat exchange tubes 11 arranged vertically. Each row of heat exchange tubes 1 is used to connect the heat exchange fins in the heat pump in series. The three rows of heat exchange tubes 1 are arranged in the direction from the windward side to the leeward side of the heat exchange fins, and the refrigerant liquid pipe 2 and the refrigerant gas pipe 3 are respectively connected to each row of heat exchange tubes 1. Among them, the structure of the bottom flow path group 200 includes a first open circulation path 201, a second open circulation path 202, and a third open circulation path 203. However, in the position close to the bottom of the heat exchange fins, four heat exchange tubes 11 with relatively high arrangement positions in the row of heat exchange tubes 1 close to the windward side (i.e., the first row of heat exchange tubes 1 from the left) are connected in series by one end of the first open circulation path 201, and four heat exchange tubes 11 with relatively low arrangement positions in the row of heat exchange tubes 1 close to the leeward side (i.e., the third row of heat exchange tubes 1 from the left) are connected in series by the other end of the first open circulation path 201; four heat exchange tubes 11 with relatively low arrangement positions in the row of heat exchange tubes 1 close to the windward side (i.e., the first row of heat exchange tubes 1 from the left) are connected in series by one end of the second open circulation path 202, and four heat exchange tubes 11 with relatively high arrangement positions in the row of heat exchange tubes 1 close to the leeward side (i.e., the third row of heat exchange tubes 1 from the left) are connected in series by the other end of the second open circulation path 202; four heat exchange tubes 11 with relatively high arrangement positions and four heat exchange tubes 11 with relatively low arrangement positions in the row of heat exchange tubes 1 located between the windward side and the leeward side (i.e., the second row of heat exchange tubes 1 from the left) are respectively connected in series by the two ends of the third open circulation path 203. More specifically, on the windward side of the heat exchange fins, the lower end of the first open circulation path 201 is connected to the refrigerant liquid pipe 2, and the upper end of the second open circulation path 202 is connected to the refrigerant gas pipe 3; on the leeward side of the heat exchange fins, the upper end of the first open circulation path 201 is connected to the refrigerant gas pipe 3, and the lower end of the second open circulation path 202 is connected to the refrigerant liquid pipe 2; between the windward side and the leeward side of the heat exchange fins, the lower end of the upper section flow path of the third open circulation path 203 is connected to the refrigerant liquid pipe 2, and the upper end of the lower section flow path of the third open circulation path 203 is connected to the refrigerant gas pipe 3.

[0043] It can be understood that in the above structure, the 11th, 12th and 13th liquid distribution pipes 22 connected to the bottom of the main liquid pipe 21 adopt a cross-pipe arrangement of upper and lower cross-pipes, and the heat exchange tubes 11 near the top and bottom positions of the heat exchange fins do not adopt the connection structure of the middle flow path group 100, but are connected by a structure of three open loop flow paths, which is equivalent to using a cross-pipe arrangement combined with upper and lower cross-pipes to cross-arrange the flow paths of the first row of heat exchange tubes and the third row of heat exchange tubes to balance the heat exchange effects of the leeward side and the windward side. This method is adopted because the conventional arrangement of the lower flow path of the heat exchanger will lead to low bottom temperature and severe frost under low-temperature heating conditions. If the water tray is not drained smoothly, it will cause ice to form at the bottom of the heat exchanger, further deteriorating the heat exchange of the evaporator, resulting in a longer defrosting time and incomplete defrosting. The upper and lower cross-pipes of this embodiment, combined with the cross-pipe arrangement, make the heat exchange more uniform, the bottom temperature will not be very low, and the phenomenon of ice at the bottom of the heat exchanger can be effectively avoided, thereby improving the heat exchange effect of the evaporator.

[0044] Since the first open circulation path 201 , the second open circulation path 202 , and the third open circulation path 203 are respectively connected in series with the same number of heat exchange tubes 11 , the heat exchange at the bottom of the fin heat exchanger can be more uniform.

[0045] In one embodiment, specifically, the refrigerant liquid pipe 2 includes a main liquid pipe 21, on which 13 branch pipes 22 are connected in parallel, and each branch pipe 22 is respectively connected to each heat exchange tube column 1, and the refrigerant gas pipe 3 includes a main gas pipe 31, on which 13 branch pipes 32 are connected in parallel, and each branch pipe 32 is respectively connected to each heat exchange tube column 1. On the windward side of the heat exchange fin, the lower end of the first open circulation path 201 is connected to one of the liquid distribution tubes 22; on the leeward side of the heat exchange fin, the upper end of the first open circulation path 201 is connected to one of the air distribution tubes 32; on the windward side of the heat exchange fin, the upper end of the second open circulation path 202 is connected to one of the air distribution tubes 32; on the leeward side of the heat exchange fin, the lower end of the second open circulation path 202 is connected to one of the liquid distribution tubes 22; between the windward side and the leeward side of the heat exchange fin, the lower end of the upper section of the third open circulation path 203 is connected to one of the liquid distribution tubes 22, and the upper end of the lower section of the third open circulation path 203 is connected to one of the air distribution tubes 32.

[0046] In one embodiment, a top flow path 7 is further provided near the top of the heat exchange fins. The two ends of the top flow path 7 are respectively connected to the refrigerant liquid pipe 2 and the refrigerant gas pipe 3 through communication. Specifically, the lower end of the top flow path 7 is connected to the main liquid pipe 21 through the access liquid distribution pipe 22, and the upper end of the top flow path 7 is connected to the main gas pipe 31 through the access gas distribution pipe 32. Among them, the top flow path 7 connects adjacent heat exchange tube columns 1 to each other by connecting at least two heat exchange tubes 11 in three heat exchange tube columns 1 in series. Specifically, in this embodiment, after the top flow path 7 is connected in series from bottom to top to two heat exchange tubes 11 in the first heat exchange tube column 1 from the left, it continues to extend to the right, and is connected in series from top to bottom to two heat exchange tubes 11 in the second heat exchange tube column 1 from the left, and then continues to extend to the right, and is connected in series from bottom to top to two heat exchange tubes 11 in the third heat exchange tube column 1 from the left. Finally, it extends to the left and returns to connect to the second heat exchange tube column 1 from the left, and is again connected in series from bottom to top to two other heat exchange tubes 11 in the second heat exchange tube column 1 from the left at more upper positions. After the above series connection is completed, the upper end of the top flow path 7 is connected to the main gas pipe 31 through the access gas distribution pipe 32. Therefore, the top flow path 7 can be responsible for supplementarily connecting the heat exchange tubes 11 that are not connected by each middle flow path group 100 at the top of the heat exchange fins.

[0047] In one embodiment, it further includes a middle flow path group 100. The structure of the middle flow path group 100 includes a single connection flow path 4 and a cross-connection flow path group. The single connection flow path 4 and the cross-connection flow path group are respectively connected to the refrigerant liquid pipe 2 and the refrigerant gas pipe 3. The heat exchange tubes 11 in the heat exchange tube column 1 (i.e., the second heat exchange tube column 1 from the left) between the windward side and the leeward side are connected in series through the single connection flow path 4, while the heat exchange tube column 1 (i.e., the first heat exchange tube column 1 from the left) close to the windward side and the heat exchange tube column 1 (i.e., the third heat exchange tube column 1 from the left) close to the leeward side are directly connected to each other through the access cross-connection flow path group. It can be understood that the flow path structure solution in this embodiment first sets a cross-connection flow path group and a single connection flow path 4 on the refrigerant pipeline of the heat exchanger. In order to balance the heat exchange effects on both sides of the fin heat exchanger, the heat exchange tube column 1 (i.e., the first heat exchange tube column 1 from the left) close to the windward side and the heat exchange tube column 1 (i.e., the third heat exchange tube column 1 from the left) close to the leeward side are directly connected to each other through the access cross-connection flow path group, that is, the cross-connection flow path group directly crosses the heat exchange tube column 1 (i.e., the second heat exchange tube column 1 from the left) between the windward side and the leeward side, and directly connects the heat exchange tube column 1 on the windward side to the heat exchange tube column 1 on the leeward side, which is beneficial to solving the problem of uneven heat exchange of the pipelines on both sides in the existing fin heat exchanger. And several heat exchange tubes 11 in the heat exchange tube column 1 between the windward side and the leeward side are connected in series through the single connection flow path 4, so that the heat exchange tube column 1 in the middle of the fin heat exchanger operates independently between the heat exchange tube columns 1 on the windward side and the leeward side. By this structure, the refrigerant flow path of the fin heat exchanger is optimized, so that the fin heat exchanger has a more uniform heat exchange effect.

[0048] Regarding the above-mentioned cross-connecting flow path group structure, specifically, the structure of the cross-connecting flow path group includes a first cross-connecting flow path 5 and a second cross-connecting flow path 6. The first cross-connecting flow path 5 and the second cross-connecting flow path 6 cross and avoid each other on the heat exchange fins. The two ends of the first cross-connecting flow path 5 are respectively connected to the refrigerant liquid pipe 2 and the refrigerant gas pipe 3, and the two ends of the second cross-connecting flow path 6 are also respectively connected to the refrigerant liquid pipe 2 and the refrigerant gas pipe 3. In addition, the first cross-connecting flow path 5 straddles the longitudinal row of heat exchange tubes 1 between the windward side and the leeward side. Four heat exchange tubes 11 among the longitudinal row of heat exchange tubes 1 close to the windward side are connected in series by the lower end of the first cross-connecting flow path 5, and four heat exchange tubes 11 among the longitudinal row of heat exchange tubes 1 close to the leeward side are connected in series by the upper end of the first cross-connecting flow path 5. The second cross-connecting flow path 6 also straddles the longitudinal row of heat exchange tubes 1 between the windward side and the leeward side. Four heat exchange tubes 11 among the longitudinal row of heat exchange tubes 1 close to the leeward side are connected in series by the lower end of the second cross-connecting flow path 6, and four heat exchange tubes 11 among the longitudinal row of heat exchange tubes 1 close to the windward side are connected in series by the upper end of the second cross-connecting flow path 6. In this structure, part of the flow paths of the first longitudinal row of heat exchange tubes 1 and the third longitudinal row of heat exchange tubes 1 from the left are arranged in a way that the first cross-connecting flow path 5 and the second cross-connecting flow path 6 cross each other. Since the first longitudinal row of heat exchange tubes 1 from the left is on the windward side of the heat exchanger and has a better heat exchange effect, while the third longitudinal row of heat exchange tubes 1 from the left is on the leeward side of the heat exchanger and has a poorer heat exchange effect, the pipeline structure with the first cross-connecting flow path 5 and the second cross-connecting flow path 6 arranged in a cross manner can balance the heat exchange effects of the first row of heat exchange tubes 11 and the third row of heat exchange tubes 11, and indirectly make the refrigerant distribution more uniform.

[0049] In one embodiment, the lower end of the first cross-connecting flow path 5, the lower end of the second cross-connecting flow path 6, and the lower end of the single-connecting flow path 4 are respectively connected to the refrigerant liquid pipe 2, and the upper end of the first cross-connecting flow path 5, the upper end of the second cross-connecting flow path 6, and the upper end of the single-connecting flow path 4 are respectively connected to the refrigerant gas pipe 3. Through the above pipeline structure, when the heat exchanger is in the heating condition, the refrigerant can flow in the way of bottom-in and top-out, and when the heat exchanger is in the refrigeration condition, the refrigerant flows in the way of top-in and bottom-out. This way can better conform to the heat exchange characteristics of the refrigerant and has a better heat exchange effect. That is to say, when the finned heat exchanger is used as an evaporator in the heating condition (such as Figure 3As shown in the figure, the refrigerant enters the lower ends of the first cross-connection flow path 5, the second cross-connection flow path 6, and the single-connection flow path 4 respectively from the refrigerant liquid pipe 2. Taking the first cross-connection flow path 5 as an example, at this time, the refrigerant entering from the lower end of the first cross-connection flow path 5 is in a liquid state with a large density, and the liquid refrigerant is made to flow from the lower end to the upper end of the first cross-connection flow path 5, that is, the liquid refrigerant flows from bottom to top. As the refrigerant continuously absorbs heat, the liquid slowly turns into a gas and its volume increases. During the process of flowing from bottom to top, the vaporized part of the refrigerant will not cause obvious resistance or pressure to the liquid refrigerant, which is beneficial to reducing the pressure drop during the refrigerant cycle and thus improving the heat exchange efficiency. Similarly, in the refrigeration condition, when the fin heat exchanger is used as a condenser (as shown in Figure 4 the figure), the refrigerant enters the upper ends of the first cross-connection flow path 5, the second cross-connection flow path 6, and the single-connection flow path 4 from the refrigerant gas pipe. Taking the first cross-connection flow path 5 as an example again, at this time, the refrigerant entering from the upper end of the first cross-connection flow path 5 is a high-pressure gas. During the process of flowing from top to bottom in the first cross-connection flow path 5, as the refrigerant continuously releases heat, it slowly turns into a liquid. Due to the gravity factor, the converted liquid refrigerant can flow more smoothly from top to bottom. At this time, it is beneficial to reduce the pressure drop of the refrigerant cycle and improve the heat exchange efficiency. Therefore, the flow path design of the heat exchanger in this application follows the flow characteristics of the refrigerant under different working conditions, conforms to its different flow directions, reduces the refrigerant flow resistance, and improves the heat exchange efficiency.

[0050] In one embodiment, the number of the upper ends of the first cross-connection flow path 5 connected in series to the heat exchange tube 11 is the same as the number of the lower ends of the first cross-connection flow path 5 connected in series to the heat exchange tube 11. Similarly, the number of the upper ends of the second cross-connection flow path 6 connected in series to the heat exchange tube 11 is the same as the number of the lower ends of the second cross-connection flow path 6 connected in series to the heat exchange tube 11, and the number of the single-connection flow path 4, the first cross-connection flow path 5, and the second cross-connection flow path 6 connected in series to the heat exchange tube 11 is the same. Specifically, in this embodiment, the number of the upper and lower ends of the first cross-connection flow path 5 connected in series to the heat exchange tube 11 is 4 each, a total of 8. The number of the upper and lower ends of the second cross-connection flow path 6 connected in series to the heat exchange tube 11 is also 4 each, also a total of 8. And the number of the single-connection flow path 4 connected in series to the heat exchange tube 11 is 8, which is the same as the number of the heat exchange tubes 11 connected in series to the first cross-connection flow path 5 and the second cross-connection flow path 6. Through the above structure, it is beneficial for the heat exchanger to have a more uniform heat exchange effect during operation.

[0051] More specifically, the number of the middle flow path groups 100 is three, and the middle flow path groups 100 are vertically distributed. The numbers of the single connection flow paths 4, the first cross-connection flow paths 5 and the second cross-connection flow paths 6 of each middle flow path group 100 connected in series to the heat exchange tubes 11 are all eight. That is to say, the above-mentioned 13 liquid distribution tubes 22 are respectively connected in series to eight heat exchange tubes 11 through the single connection flow paths 4, the first cross-connection flow paths 5 and the second cross-connection flow paths 6. And the above-mentioned 13 gas distribution tubes 32 are also respectively connected in series to eight heat exchange tubes 11 through the single connection flow paths 4, the first cross-connection flow paths 5 and the second cross-connection flow paths 6. It can be understood that compared with the conventional heat exchanger flow path structure, in this application, the number of the liquid distribution tubes 22 and the gas distribution tubes 32 is reduced to 13, and the number of the heat exchange tubes 11 connected in series by each liquid distribution tube 22 and gas distribution tube 32 is increased to eight, which can extend the length of a single flow path, and the lengths of all flow paths are the same. Because the heat exchanger has a horizontal air outlet, the wind speed of the whole heat exchanger is relatively uniform, and the flow path lengths are the same, which can make the refrigerant distribution more uniform. The flow path of the conventional heat exchanger is too short. When the heat exchanger operates in the refrigeration condition and acts as a condenser, due to insufficient condensation of the refrigerant, the heat exchange effect is poor, resulting in high power consumption and poor refrigeration effect. However, the heat exchanger flow path provided by the solution of the present utility model is significantly extended, and the flow path lengths of the refrigeration and heating conditions are balanced, so as to improve the heat exchange effect under the refrigeration condition and solve the heat exchange problem under the refrigeration condition.

[0052] In addition, this embodiment further provides a refrigeration or heating device, the structure of which includes the fin heat exchanger flow path structure for improving bottom frosting as described above.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A fin heat exchanger flow path structure for improving bottom frosting, comprising: A plurality of heat exchange tube longitudinal rows (1), each comprising a plurality of heat exchange tubes (11) arranged vertically, each of the heat exchange tube longitudinal rows (1) being arranged in a direction from the windward side to the leeward side of the heat exchange fin; A refrigerant liquid pipe (2) and a refrigerant gas pipe (3), wherein the refrigerant liquid pipe (2) and the refrigerant gas pipe (3) are respectively connected to each of the heat exchange tube columns (1); characterized in that it also includes a bottom flow path group (200) for being arranged at the bottom position of the heat exchange fin, and the bottom flow path group (200) includes a first open loop flow path (201), a second open loop flow path (202) and a third open loop flow path (203); A plurality of heat exchange tubes (11) arranged at higher positions in the heat exchange tube column (1) close to the windward side are connected in series by one end of the first open circulation path (201), and a plurality of heat exchange tubes (11) arranged at lower positions in the heat exchange tube column (1) close to the leeward side are connected in series by the other end of the first open circulation path (201); A plurality of heat exchange tubes (11) arranged at lower positions in the heat exchange tube column (1) close to the windward side are connected in series to one end of the second open circulation path (202), and a plurality of heat exchange tubes (11) arranged at higher positions in the heat exchange tube column (1) close to the leeward side are connected in series to the other end of the second open circulation path (202); A plurality of heat exchange tubes (11) arranged at higher positions and a plurality of heat exchange tubes (11) arranged at lower positions in the heat exchange tube vertical row (1) between the windward side and the leeward side are respectively connected in series at both ends of the third open circulation path (203).

2. The fin heat exchanger flow path structure for improving bottom frost formation according to claim 1, characterized in that: The first open circulation path (201), the second open circulation path (202) and the third open circulation path (203) are respectively connected in series with the same number of heat exchange tubes (11).

3. The flow path structure of the fin heat exchanger for improving bottom frost formation according to claim 1, characterized in that: In the heat exchange tube column (1) close to the windward side, the first open circulation path (201) is connected in series to four heat exchange tubes (11) arranged at a higher position, and the second open circulation path (202) is connected in series to four heat exchange tubes (11) arranged at a lower position; In the heat exchange tube column (1) close to the leeward side, the first open circulation path (201) is connected in series to four heat exchange tubes (11) arranged at a lower position, and the second open circulation path (202) is connected in series to four heat exchange tubes (11) arranged at a higher position; Between the windward side and the leeward side of the heat exchange fin, the upper section of the third open circulation path (203) is connected in series to four heat exchange tubes (11) arranged at a higher position, and the lower section of the third open circulation path (203) is connected in series to four heat exchange tubes (11) arranged at a lower position.

4. The fin heat exchanger flow path structure for improving bottom frost formation according to claim 1, characterized in that: On the windward side of the heat exchange fin, the lower end of the first open circulation path (201) is connected to the refrigerant liquid pipe (2), and the upper end of the second open circulation path (202) is connected to the refrigerant gas pipe (3); On the leeward side of the heat exchange fin, the upper end of the first open circulation path (201) is connected to the refrigerant gas pipe (3), and the lower end of the second open circulation path (202) is connected to the refrigerant liquid pipe (2); Between the windward side and the leeward side of the heat exchange fin, the lower end of the upper flow path of the third open circulation path (203) is connected to the refrigerant liquid pipe (2), and the upper end of the lower flow path of the third open circulation path (203) is connected to the refrigerant gas pipe (3).

5. The flow path structure of the fin heat exchanger for improving bottom frost formation according to claim 4, characterized in that: The refrigerant liquid pipe (2) comprises a main liquid pipe (21), and a plurality of liquid distribution pipes (22) are connected in parallel to the main liquid pipe (21), and each liquid distribution pipe (22) is respectively connected to each of the heat exchange tube vertical rows (1); The refrigerant gas pipe (3) comprises a main gas pipe (31), to which a plurality of branch gas pipes (32) are connected in parallel, and each branch gas pipe (32) is respectively connected to each of the heat exchange tube vertical rows (1).

6. The flow path structure of the fin heat exchanger for improving bottom frost formation according to claim 5, characterized in that: On the windward side of the heat exchange fin, the lower end of the first open circulation path (201) is connected to one of the liquid distribution pipes (22); on the leeward side of the heat exchange fin, the upper end of the first open circulation path (201) is connected to one of the air distribution pipes (32); On the windward side of the heat exchange fin, the upper end of the second open circulation path (202) is connected to one of the air distribution pipes (32); on the leeward side of the heat exchange fin, the lower end of the second open circulation path (202) is connected to one of the liquid distribution pipes (22); Between the windward side and the leeward side of the heat exchange fin, the lower end of the upper flow path of the third open loop flow path (203) is connected to one of the liquid distribution pipes (22), and the upper end of the lower flow path of the third open loop flow path (203) is connected to one of the air distribution pipes (32).

7. The flow path structure of the fin heat exchanger for improving bottom frost formation according to claim 5, characterized in that: It also includes a top flow path (7) arranged near the top of the heat exchange fin, and the top flow path (7) connects the heat exchange tubes (11) in each heat exchange tube column (1) in series to allow adjacent heat exchange tube columns (1) to communicate with each other.

8. The flow path structure of the fin heat exchanger for improving bottom frost formation according to claim 7, characterized in that: At least two heat exchange tubes (11) in each of the heat exchange tube columns (1) are connected in series by the top flow path (7).

9. The fin heat exchanger flow path structure for improving bottom frost formation according to claim 7, characterized in that: One end of the top flow path (7) is connected to one of the liquid distribution pipes (22), and the other end is connected to one of the gas distribution pipes (32).

10. A cooling or heating device, characterized in that: The invention comprises a flow path structure of a fin heat exchanger for improving bottom frosting as described in any one of claims 1 to 9.

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